-module(edrp_cache).

-behaviour(gen_server).

%% API
-compile(export_all).

%% gen_server callbacks
-export([init/1,
         handle_call/3,
         handle_cast/2,
         handle_info/2,
         terminate/2,
         code_change/3]).

%%==========================================================================
%% API
%%==========================================================================

%%--------------------------------------------------------------------------
%% Function: start_link() -> {ok, Pid} | ignore | {error, Error}
%% Description: Starts the server
%%--------------------------------------------------------------------------
start_link() ->
    gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).

%%--------------------------------------------------------------------------
%% Function: init(Args) ->  {ok, State}          |
%%                          {ok, State, Timeout} |
%%                          ignore               |
%%                          {stop, Reason}       
%% Description: Initiates the server
%%--------------------------------------------------------------------------
init([]) ->
    {ok, {}}.

%%--------------------------------------------------------------------------
%% Function: handle_call(Request, From, State) -> 
%%                          {reply, Reply, State}           |
%%                          {reply, Reply, State, Timout}   |
%%                          {noreply, State}                |
%%                          {noreply, State, Timeout}       |
%%                          {stop, Reason, Reply, State}    |
%%                          {stop, Reason, State}           
%% Description: Handling call messages
%%--------------------------------------------------------------------------
% Called by edrp_cache to get the ttl threhshould.
handle_call(_Request, _From, State) ->
    {noreply, State}.

%%--------------------------------------------------------------------------
%% Funtion: handle_cast(Msg, State) -> {noreply, State}         |
%%                                     {noreply, State, Timeout}|
%%                                     {stop, Reason, State}
%% Description: Handling cast messages
%%--------------------------------------------------------------------------
% Called by edrp_cache to increase cache access count.
handle_cast(_Msg, State) ->
    {noreply, State}.

%%--------------------------------------------------------------------------
%% Function: handle_info(Info, State) -> {noreply, State}           |
%%                                       {noreply, State, Timeout}  |
%%                                       {stop, Reason, State}
%% Description: handling all non call/cast messages
%%--------------------------------------------------------------------------
handle_info(_Info, State) ->
    {noreply, State}.

%%--------------------------------------------------------------------------
%% Function: terminate(Reason, State) -> void()
%% Description: This function is called by a gen_server when it is about to
%%              terminate. It should be the opposite of Module:init/1 and 
%%              do any necessary cleaning up. When it returns, the
%%              gen_server terminates with Reason. The return is ignored.
%%--------------------------------------------------------------------------
terminate(_Reason, _State) ->
    ok.

%%--------------------------------------------------------------------------
%% Function: code_change(OldVsn, State, Extra) -> {ok, NewState}
%% Description: Convert process state when code is changed
%%--------------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
    {ok, State}.
